CentOS 7 安装 JAVA环境（JDK 1.8）

wget http://download.oracle.com/otn-pub/java/jdk/8u171-b11/512cd62ec5174c3487ac17c61aaa89e8/jdk-8u171-linux-x64.tar.gz?AuthParam=1531155951_4e06a4d17c6c1dbfb8440352e19dd2ae

ls -lht

mkdir /usr/local/java/

tar -zxvf jdk-8u171-linux-x64.tar.gz -C /usr/local/java/

vim /etc/profile

export JAVA_HOME=/usr/local/java/jdk1.8.0_171
export JRE_HOME=${JAVA_HOME}/jre
export CLASSPATH=.:${JAVA_HOME}/lib:${JRE_HOME}/lib
export PATH=${JAVA_HOME}/bin:$PATH

source /etc/profile

java -version